Repair device for threaded members

ABSTRACT

A repair device includes a base member having a notch-like recess for receiving threaded members, and having an oblong hole formed in one end for slidably receiving a pivot shaft. A pair of arms each includes one end rotatably and slidably secured to the base member by the sliding engagement of the pivot shaft in the oblong hole of the base member, and the other end having a chamfer for engaging with the threaded members. A conduit is rotatably secured to the base member, a rod is threaded with the conduit, and a link is coupled between the arms and the rod, for allowing the arms to slide relative to the base member and the threaded members.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a repair device, and more particularly to a repair device for repairing threads of threaded members.

[0003] 2. Description of the Prior Art

[0004] Typical tapping screws or tools have been developed for tapping or repairing threads of threaded members. However, the typical tapping screws or tools include a fixed outer diameter and thus may be used for repairing only one kind or only one predetermined thread size of threaded objects only.

[0005] The other typical repair devices have been developed for repairing threaded members of different sizes or outer diameters. U.S. Pat. No. 5,060,330 to Stahl discloses one of the typical repair devices including an elongated prismatic member having a notch-like recess formed therein for receiving various threaded members, and including a pair of thread-chasing arms having chamfers for engaging with and for repairing the threads of the threaded members.

[0006] However, the thread-chasing arms include one end pivotally secured to the elongated prismatic member with a hinge pin, and may only be rotated relative to the elongated prismatic member about the hinge pin, but may not be slid or moved relative to the elongated prismatic member. In addition, the threaded members are stably received in the notch-like recess of the elongated prismatic member, and may not be moved relative to the elongated prismatic member, such that the typical repairing device may only be used to repair the threaded members of limited outer diameters.

[0007] The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional repair device for threaded members.

SUMMARY OF THE INVENTION

[0008] The primary objective of the present invention is to provide a repair device including a pair of thread-chasing arms rotatably and slidably secured to a base member, and thus not only rotatable but also slidable relative to the base member, for allowing the thread-chasing arms to effectively or snugly engage with and to repair various threaded members of various or different outer diameters that are supported on the base member.

[0009] In accordance with one aspect of the invention, there is provided a repair device for threaded members comprising a base member including a middle and lower portion having a cavity formed therein, and including a first end having a notch-like recess formed therein for receiving the threaded members, and including a second end having an oblong hole formed therein, a pivot shaft slidably received in the oblong hole of the base member and movable relative to the base member, a pair of arms each including a first end secured to the pivot shaft and thus rotatable and slidable relative to the base member with a sliding engagement of the pivot shaft in the oblong hole of the base member, and the arms each including a second end having a chamfer provided therein for engaging with the threaded members, the arms each including a middle portion, a conduit rotatably secured to the lower portion of the base member, and including a screw hole formed therein, a rod including a threaded portion formed thereon and threaded with the screw hole of the conduit, and including a first end, and a link including a first end pivotally secured to the middle portions of the arms, and a second end pivotally secured to the first end of the rod, to pivotally couple the arms to the rod, and to allow the second ends of the arms to be moved toward and away from the base member by rotating the conduit relative to the rod. The second ends of the arms are movable toward and away from the threaded members that are supported in the notch-like recess of the base member by a sliding engagement of the pivot shaft in the oblong hole of the base member.

[0010] The base member includes a lateral orifice formed therein and communicating with the cavity thereof, and includes a lock pin engaged through the lateral orifice of the base member and engaged into the cavity of the base member, the conduit includes a first end rotatably received in the cavity of the base member and having an outer peripheral depression formed therein for receiving the lock pin which rotatably secures the conduit to the base member.

[0011] The second end of the link includes a slot formed therein, the first end of the rod includes a fin rotatably received in the slot of the link. A handle may further be provided and secured to the conduit, to rotate the conduit relative to the base member, and thus to rotate the conduit relative to the rod, in order to adjust the arms and the link relative to the base member.

[0012] Further objectives and advantages of the present invention will become apparent from a careful reading of the detailed description provided hereinbelow, with appropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0013]FIG. 1 is an exploded view of a repair device for threaded members in accordance with the present invention;

[0014]FIG. 2 is a perspective view of the repair device for threaded members;

[0015]FIGS. 3, 4 are cross sectional views taken along lines 3-3 and 4-4 of FIG. 2 respectively;

[0016]FIGS. 5, 6 are cross sectional views similar to FIG. 3, Illustrating the operation of the repair device for threaded members;

[0017]FIGS. 7, 8 are cross sectional views taken along lines 7-7 and 8-8 of FIGS. 5 and 6 respectively; and

[0018]FIGS. 9, 10 are enlarged partial cross sectional views of FIGS. 7 and 8 respectively, illustrating the operation of the repair device for threaded members.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0019] Referring to the drawings, and initially to FIGS. 1-4, a repair device for threaded members in accordance with the present invention comprises a base member 10 including a cavity 11 formed in the middle and lower portion thereof. A conduit 20 includes one end engaged in the cavity 11 of the base member 10 and having an outer peripheral depression 21 formed therein, and includes a screw hole 22 formed in the one end thereof. The conduit 20 includes a bore 23 formed in the other end thereof for receiving and securing one end of a handle 60.

[0020] The base member 10 includes a lateral orifice 12 formed therein and intersecting or communicating with the cavity 11 of the base member 10. A lock pin 24 is engaged through the lateral orifice 12 of the base member 10, and engaged into the outer peripheral depression 21 of the conduit 20, for rotatably securing the conduit 20 to the base member 10, and for allowing the conduit 20 to be rotated relative to the base member 10 with the handle 60.

[0021] The base member 10 includes a notch-like recess 15 formed in one side of the upper portion thereof, and a chamber 16 formed in the other side of the upper portion thereof and defined by a pair of walls 13, and includes a bulge 17 extended into the chamber 16 from one end thereof, for forming or defining a pair of channels 18 between the bulge 17 and the walls 13.

[0022] A rod 30 includes a threaded portion 31 for threading with the screw hole 22 of the conduit 20, and includes a fin 32 extended from one end thereof and having a hole 33 formed therein. A pair of thread-chasing arms 50 are rotatably received in the chamber 16 and the channels 18 of the base member 10, and each includes one end rotatably secured to the base member 10 with a pivot shaft 19, and each includes another end having a chamfer 53 formed therein for engaging with and for repairing threads 70 of threaded members 7 that are received in the notch-like recess 15 of the base member 10.

[0023] The above-described structure of the repair device is typical and has been disclosed in U.S. Pat. No. 5,060,330 to Stahl which may thus be taken as a reference for the present invention.

[0024] The arms 50 each includes a hole 52 formed in the one end thereof for receiving the pivot shaft 19, and another hole 51 formed in the middle portion thereof. A coupling member 40 includes a hole 42 formed in one end thereof, and another hole 41 formed in the other end thereof. An axle 54 is engaged through the holes 51 of the arms 50 and the hole 42 of the coupling member 40, for rotatably or pivotally securing the link 40 to and between the arms 50.

[0025] A pole 34 is engaged through the hole 41 of the coupling member 40, and the hole 33 of the fin 32 of the rod 30, for rotatably or pivotally securing the rod 30 to the coupling member 40. The coupling member 40 may include a slot 43 formed in the other end thereof for rotatably or movably receiving the fin 32 of the rod 30, and thus for allowing the rod 30 to be solidly and rotatably secured to the coupling member 40.

[0026] As best shown in FIGS. 1-3, 5 and 6, the base member 10 includes an oblong hole 14 formed in the one end thereof, such as formed in the walls 13 and the bulge 17 thereof, for slidably receiving the pivot shaft 19, and thus for allowing the arms 50 to be both rotated and slid relative to the base member 10, and thus to be moved relative to the threaded members 7 that are received in the notch-like recess 15 of the base member 10. In operation, the threaded members 7 of various or different outer diameters may be selectively received in the notch-like recess 15 of the base member 10, as shown in FIGS. 5, 6.

[0027] In operation, as shown in FIGS. 5-10, the arms 50 may be moved or adjusted toward or away from the base member 10 by rotating the conduit 20 with the handle 60 relative to the rod 30. The sliding movement or engagement of the pivot shaft 19 in the oblong hole 14 of the base member 10, and the pivotal coupling of the coupling member 40 between the rod 30 and the arms 50, allows the arms 50 to be moved relative to the threaded members 7, and thus for allowing the chamfers 53 of the arms 50 to effectively engage with and to repair the threads 70 of the threaded members 7 that have various or different outer diameters.

[0028] Accordingly, the repair device for threaded members In accordance with the present invention includes a pair of thread-chasing arms rotatably and slidably secured to a base member, and thus not only rotatable but also slidable relative to the base member, for allowing the thread-chasing arms to effectively or snugly engage with and to repair various threaded members of various or different outer diameters that are supported on the base member.

[0029] Although this invention has been described with a certain degree of particularity, it is to be understood that the present disclosure has been made by way of example only and that numerous changes in the detailed construction and the combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as hereinafter claimed. 

I claim:
 1. A repair device for threaded members comprising: a base member including a middle and lower portion having a cavity formed therein, and including a first end having a notch-like recess formed therein for receiving the threaded members, and including a second end having an oblong hole formed therein, a pivot shaft slidably received in said oblong hole of said base member and movable relative to said base member, a pair of arms each including a first end secured to said pivot shaft and thus rotatable and slidable relative to said base member with a sliding engagement of said pivot shaft in said oblong hole of said base member, and said arms each including a second end having a chamfer provided therein for engaging with the threaded members, said arms each including a middle portion, a conduit rotatably secured to said lower portion of said base member, and including a screw hole formed therein, a rod including a threaded portion formed thereon and threaded with said screw hole of said conduit, and including a first end, and a link including a first end pivotally secured to said middle portions of said arms, and a second end pivotally secured to said first end of said rod, to pivotally couple said arms to said rod, and to allow said second ends of said arms to be moved toward and away from said base member by rotating said conduit relative to said rod, said second ends of said arms being movable toward and away from the threaded members that are supported in said notch-like recess of said base member by a sliding engagement of said pivot shaft in said oblong hole of said base member.
 2. The repair device as claimed in claim 1, wherein said second end of said link includes a slot formed therein, said first end of said rod includes a fin rotatably received in said slot of said link.
 3. The repair device as claimed in claim 1, wherein said base member includes a lateral orifice formed therein and communicating with said cavity thereof, and includes a lock pin engaged through said lateral orifice of said base member and engaged into said cavity of said base member, said conduit includes a first end rotatably received in said cavity of said base member and having an outer peripheral depression formed therein for receiving said lock pin which rotatably secures said conduit to said base member.
 4. The repair device as claimed in claim 1 further comprising a handle secured to said conduit, to rotate said conduit relative to said base member. 